An ink jet printer has a line print type recording heads, respectively
extending in a width direction of a recording medium, for jetting ink to
the recording medium, and ultraviolet ray irradiating devices, having
ultraviolet ray sources, for irradiating the ink arriving at the
recording medium with ultraviolet rays to cure the ink. The ultraviolet
ray irradiating devices are arranged on a downstream side of the
recording heads in a feeding direction of the recording medium. A
quantity of the ultraviolet rays emitted from the ultraviolet ray sources
of the ultraviolet ray irradiating device, which is arranged on the most
downstream side in the feeding direction of the recording medium, is set
to be larger than that of the ultraviolet rays emitted from the
ultraviolet ray sources of each of the other ultraviolet ray irradiating
devices.